Evaluation of biogas production and bacterial load from co-digestion of chicken manure with different types of household waste

JSFA reports Pub Date : 2024-05-27 DOI:10.1002/jsf2.206

Mohammad Enamul Haque, Roman Ryndin, Heinz-Peter Mang, Humayun Kabir, Mohammad Alimul Islam

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Abstract

Background

The aim of this study was to evaluate the biogas production of chicken manure (CM) co-digestion with different types of household waste (soft organic [SO] and food waste [FW]), as well as to evaluate the bacterial load of feeding stock and digested slurry samples before and after anaerobic digestion (AD). The experiment was carried out using lab-based prototype digesters for co-digestion of CM with different household wastes (5%). Three experimental groups (T1, T2, and T3) were designed using mixing ratios of SO:CM:H₂O:inoculum (5:22.5:22.5:50), FW:CM:H₂O:inoculum (5:22.5:22.5:50), and (SO + FW):CM:H₂O:inoculum (2.5 + 2.5:22.5:22.5:50). The digesters were set at 28–34°C for 30 days for hydraulic retention time (HRT). Total viable count (TVC), Escherichia coli, and Salmonella spp. counts were determined using the spread plate technique.

Results

The study revealed that the highest average cumulative biogas yield was achieved from T1 > T3 > T2, but the concentration of CH₄ was found in T3 > T2 > T1. The biogas production between the three groups was statistically nonsignificant (p > 0.05) but the daily concentration of CH₄ was found statistically significant (p < 0.05). The average concentration of CH₄ and CO₂ in biogas was found to be 30% and 68% for T1, 60% and 37% for T2, and 69% and 27% for T3. However, the H₂S content was within the acceptable range. The bacterial load was decreased by 2–3 logs before and after AD, and this reduction was statistically significant (p < 0.05).

Conclusion

The research found that the co-digestion of CM with combined household wastes increased the methane concentration in biogas.

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评估鸡粪与不同类型生活垃圾共同消化产生的沼气和细菌量

背景本研究旨在评估鸡粪（CM）与不同类型的生活垃圾（软有机物 [SO] 和厨余 [FW]）共同消化产生的沼气，以及评估厌氧消化（AD）前后饲养料和消化浆样品的细菌负荷。实验使用实验室原型消化器进行，用于共同消化中药和不同的生活垃圾（5%）。设计了三个实验组（T1、T2 和 T3），混合比例分别为 SO:CM:H2O:接种物（5:22.5:22.5:50）、FW:CM:H2O:接种物（5:22.5:22.5:50）和（SO + FW）:CM:H2O:接种物（2.5 + 2.5:22.5:22.5:50 ）。沼气池在 28-34°C 的温度下设置 30 天的水力停留时间（HRT）。采用平板技术测定了总存活数（TVC）、大肠杆菌和沙门氏菌的数量。结果研究表明，T1 > T3 > T2 的平均累积沼气产量最高，但 T3 > T2 > T1 的 CH4 浓度最高。三组之间的沼气产量差异无统计学意义（p >0.05），但 CH4 的日浓度差异有统计学意义（p <0.05）。T1 组沼气中 CH4 和 CO2 的平均浓度分别为 30% 和 68%，T2 组分别为 60% 和 37%，T3 组分别为 69% 和 27%。不过，H2S 含量在可接受范围内。在厌氧消化前后，细菌量减少了 2-3 个对数，而且这种减少具有显著的统计学意义（p < 0.05）。结论研究发现，中药与综合生活垃圾共同消化可提高沼气中的甲烷浓度。

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